The Raptured

I have an American friend who would strongly prefer to move their family to Canada. 2 adults, 4 children; both adults have degrees and professional credentials that would transfer across the border. They're currently looking for work, both abroad and in bluer states than theirs.

The question they asked me was:

Is immigrating to Canada something we can do on our own or do we need an immigration lawyer? I have been looking at requirements and it all seems straightforward enough, but I don’t want to be unpleasantly surprised

Any thoughts on the process would be welcome, like if/when a lawyer is needed, or if/when agencies that promise to help with the moving process are actually worth their fees.

Thanks! Comments are screened for people who'd rather stay private, and I'll pass the messages along.